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1 EESTI STANDARD EVS-EN ISO 14912:2006 Gas analysis - Conversion of gas mixture composition data Gas analysis - Conversion of gas mixture composition data EESTI STANDARDIKESKUS

2 EESTI STANDARDI EESSÕNA NATIONAL FOREWORD Käesolev Eesti standard EVS-EN ISO 14912:2006 sisaldab Euroopa standardi EN ISO 14912:2006 ingliskeelset teksti. Käesolev dokument on jõustatud ja selle kohta on avaldatud teade Eesti standardiorganisatsiooni ametlikus väljaandes. Standard on kättesaadav Eesti standardiorganisatsioonist. This Estonian standard EVS-EN ISO 14912:2006 consists of the English text of the European standard EN ISO 14912:2006. This document is endorsed on with the notification being published in the official publication of the Estonian national standardisation organisation. The standard is available from Estonian standardisation organisation. Käsitlusala: This International Standard defines the following quantities commonly used to express the composition of gas mixtures: - mole fraction, - mass fraction, - volume fraction, and - mole concentration, - mass concentration, - volume concentration. Scope: This International Standard defines the following quantities commonly used to express the composition of gas mixtures: - mole fraction, - mass fraction, - volume fraction, and - mole concentration, - mass concentration, - volume concentration. ICS Võtmesõnad: Eesti Standardikeskusele kuulub standardite reprodutseerimis- ja levitamisõigus

3 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN ISO August 2006 ICS English Version Gas analysis - Conversion of gas mixture composition data (ISO 14912:2003) Analyse des gaz - Conversion des données de composition de mélanges gazeux (ISO 14912:2003) Gasanalyse - Umrechnung von Zusammensetzungsangaben für Gasgemische (ISO 14912:2003) This European Standard was approved by CEN on 21 July CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 14912:2006: E

4 EN ISO 14912:2006 (E) Foreword The text of ISO 14912:2003 has been prepared by Technical Committee ISO/TC 158 "Analysis of gases of the International Organization for Standardization (ISO) and has been taken over as EN ISO 14912:2006 by Technical Committee CEN/SS N21 "Gaseous fuels and combustible gas", the secretariat of which is held by CMC. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2007, and conflicting national standards shall be withdrawn at the latest by February According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 14912:2003 has been approved by CEN as EN ISO 14912:2006 without any modifications. 2

5 INTERNATIONAL STANDARD ISO First edition Gas analysis Conversion of gas mixture composition data Analyse des gaz Conversion des données de composition de mélanges gazeux Reference number ISO 14912:2003(E) ISO 2003

6 ISO 14912:2003(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2003 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel Fax copyright@iso.org Web Published in Switzerland ii ISO 2003 All rights reserved

7 ISO 14912:2003(E) Contents Page Foreword...iv Introduction...v 1 Scope Terms and definitions Symbols and units Basic principles Expression of gas mixture composition Conversion between different quantities Conversion between different state conditions Main procedures Conversion between different quantities of composition Conversion to reference conditions Practical implementation Conversion between quantities of composition Conversion of single analyte contents Conversion of complete compositions Conversion between state conditions Simple approximations applicable to conversion Input quantities and their uncertainties Pure gas data Gas mixture data Rough uncertainty estimates Conversion uncertainty General considerations Conversion of single analyte contents Conversion of complete compositions Uncertainty calculation using numerical differentiation Variances and covariances of input composition data Application recommendations Annex A (normative) Assessment of state conditions Annex B (normative) Summation relations for the expression of mixture properties Annex C (informative) Mixture component data Annex D (informative) Examples Annex E (informative) Computer implementation of recommended methods Bibliography ISO 2003 All rights reserved iii

8 ISO 14912:2003(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO was prepared by Technical Committee ISO/TC 158, Analysis of gases. iv ISO 2003 All rights reserved

9 ISO 14912:2003(E) Introduction The objective of gas analysis is to determine the composition of gas mixtures. Gas mixture composition is expressed qualitatively in terms of specified mixture components of interest, called analytes, and the complementary gas. Gas mixture composition is expressed quantitatively by specifying the amount of every analyte in the mixture and the composition of the complementary gas. For the purpose of specifying the amount of an analyte in a gas mixture, different quantities are in use. This diversity is due to the fact that in different applications different quantities have decisive advantages. Therefore procedures for conversion between different quantities are required. In cases where these quantities involve the volumes of the analytes or the gas mixture or both, they depend on the state conditions, i.e. pressure and temperature, of the gas mixture. For each of these quantities, procedures for conversion between different state conditions are required. As a crude approximation, all of the conversions referred to above can be performed on the basis of the Ideal Gas Law. In most cases, however, an accurate conversion has to take into account the real gas volumetric behaviour of the analyte and of the gas mixture. In particular, many conversions require values of the compression factor (or of the density) of the gas mixture. This International Standard provides formally exact conversion procedures, based on fundamental principles, which fully account for real gas behaviour of pure gases and gas mixtures. In addition to these, approximate procedures for practical applications are described, designed for different levels of accuracy and available data. These approximations are necessary because measured gas mixture compression factors (or densities) are rarely available and therefore have to be estimated from component data. Uncertainty estimates are given which result from combining approximations in the conversion procedures with the uncertainties of the input data. Where conversions require real-gas volumetric data of pure gases or gas mixtures, these are expressed by compression factors. As equivalents, density data could be converted into compression factor data. ISO 2003 All rights reserved v

10 INTERNATIONAL STANDARD ISO 14912:2003(E) Gas analysis Conversion of gas mixture composition data 1 Scope This International Standard defines the following quantities commonly used to express the composition of gas mixtures: mole fraction, mass fraction, volume fraction, and mole concentration, mass concentration, volume concentration. For these quantities of composition, this International Standard provides methods for conversion between different quantities, and conversion between different state conditions. Conversion between different quantities means calculating the numerical value of an analyte content in terms of one of the quantities listed above from the numerical value of the same analyte content, at the same pressure and temperature of the gas mixture, given in terms of another of these quantities. Conversion between different state conditions means calculating the numerical value of an analyte content, in terms of one of the quantities listed above, under one set of state conditions from the numerical value of the same quantity under another set of state conditions, i.e. pressure and temperature, of the gas mixture. Gas mixture composition can be converted simultaneously between different quantities of composition and different state conditions by combination of the two types of conversion. This International Standard is applicable only to homogeneous and stable gas mixtures. Therefore any state conditions (pressure and temperature) considered need to be well outside the condensation region of the gas mixture and that of each of the specified analytes (see Annex A). 2 Terms and definitions For the purpose of this document, the following terms and definitions apply. NOTE See also References [1] and [2] in the Bibliography. 2.1 Quantities for the expression of gas mixture composition NOTE Further information concerning the terms defined in this subclause is given in 4.1. ISO 2003 All rights reserved 1

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